/*******************************************************************************
 * Copyright 2011 See AUTHORS file.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/

package com.badlogic.gdx.physics.box2d.joints;

import com.badlogic.gdx.physics.box2d.Joint;
import com.badlogic.gdx.physics.box2d.World;

/**
 * A distance joint constrains two points on two bodies to remain at a fixed distance from each other. You can view this as a
 * massless, rigid rod.
 */
public class DistanceJoint extends Joint {
	/*JNI
#include <Box2D/Box2D.h>
	 */

    public DistanceJoint(World world, long addr) {
        super(world, addr);
    }

    private native void jniSetLength(long addr, float length); /*
		b2DistanceJoint* joint = (b2DistanceJoint*)addr;
		joint->SetLength( length );
	*/

    /**
     * Set/get the natural length. Manipulating the length can lead to non-physical behavior when the frequency is zero.
     */
    public float getLength() {
        return jniGetLength(addr);
    }

    /**
     * Set/get the natural length. Manipulating the length can lead to non-physical behavior when the frequency is zero.
     */
    public void setLength(float length) {
        jniSetLength(addr, length);
    }

    private native float jniGetLength(long addr); /*
		b2DistanceJoint* joint = (b2DistanceJoint*)addr;
		return joint->GetLength();
	*/

    private native void jniSetFrequency(long addr, float hz); /*
		b2DistanceJoint* joint = (b2DistanceJoint*)addr;
		joint->SetFrequency( hz );
	*/

    /**
     * Set/get frequency in Hz.
     */
    public float getFrequency() {
        return jniGetFrequency(addr);
    }

    /**
     * Set/get frequency in Hz.
     */
    public void setFrequency(float hz) {
        jniSetFrequency(addr, hz);
    }

    private native float jniGetFrequency(long addr); /*
		b2DistanceJoint* joint = (b2DistanceJoint*)addr;
		return joint->GetFrequency();
	*/

    private native void jniSetDampingRatio(long addr, float ratio); /*
		b2DistanceJoint* joint = (b2DistanceJoint*)addr;
		joint->SetDampingRatio( ratio );
	*/

    /**
     * Set/get damping ratio.
     */
    public float getDampingRatio() {
        return jniGetDampingRatio(addr);
    }

    /**
     * Set/get damping ratio.
     */
    public void setDampingRatio(float ratio) {
        jniSetDampingRatio(addr, ratio);
    }

    private native float jniGetDampingRatio(long addr); /*
		b2DistanceJoint* joint = (b2DistanceJoint*)addr;
		return joint->GetDampingRatio();
	*/
}
